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How many multiples of 11 are there between 55 and 144, exclusive?

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Bunuel
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How many multiples of 11 are there between 55 and 144, exclusive? [#permalink] New post   19 Apr 2021, 06:15
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How many multiples of 11 are there between 55 and 144, exclusive?

A. 5

B. 6

C. 7

D. 8

E. 9
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D
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jrdenzy
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Re: How many multiples of 11 are there between 55 and 144, exclusive? [#permalink] New post   19 Apr 2021, 14:01
66 , 77 , 88 , 99 , 110 , 121 , 132 , 133

Answer D

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Re: How many multiples of 11 are there between 55 and 144, exclusive? [#permalink] New post   19 Apr 2021, 22:41
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Multiples between 55 and 144 of 11 are First term:66 and Last term: 132.

\(t_n = a + (n - 1)d\)

132 = 66 + (n - 1)11

66 = 11n - 11

77 = 11n

n = 7

Answer C
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Re: How many multiples of 11 are there between 55 and 144, exclusive? [#permalink] New post   20 Apr 2021, 07:26
MathRevolution wrote:
Multiples between 55 and 144 of 11 are First term:66 and Last term: 132.

\(t_n = a + (n - 1)d\)

132 = 66 + (n - 1)11

66 = 11n - 11

77 = 11n

n = 7

Answer C


I think the last term should be 143 which is 11*13 and is less than 144, hence the answer is n=8
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Re: How many multiples of 11 are there between 55 and 144, exclusive? [#permalink] New post   25 Apr 2021, 02:06
Multiples of 11 between 55 and 144, exclusive:
66, 77, 88, 99, 110, 121, 132, and 143 => 8

Answer (D)
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Re: How many multiples of 11 are there between 55 and 144, exclusive? [#permalink]
25 Apr 2021, 02:06
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